Must Cosmological Perturbations Remain Non-Adiabatic After Multi-Field Inflation?

Details Must Cosmological Perturbations Remain Non-Adiabatic After Multi-Field Inflation? Must Cosmological Perturbations Remain Non-Adiabatic After Multi-Field Inflation?

2004-05-20

arxiv.org/abs/astro-ph/0405397v2

Phys.Rev. D70 (2004) 083522

Astronomy and Astrophysics

Astrophysics

12 pages, typographical errors corrected, acknowledgment added. Article accepted for publication in Physical Review D

Scientific paper

10.1103/PhysRevD.70.083522

Even if non-adiabatic perturbations are generated in multi-field inflation, the perturbations will become adiabatic if the universe after inflation enters an era of local thermal equilibrium, with no non-zero conserved quantities, and will remain adiabatic as long as the wavelength is outside the horizon, even when local thermal equilibrium no longer applies. Small initial non-adiabatic perturbations associated with imperfect local thermal equilibrium remain small when baryons are created from out-of-equilibrium decay of massive particles, or when dark matter particles go out of local thermal equilibrium.

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